retrofit pump on gravity boiler

I would like to remove the old cast pipes feed two radiators in from a gravity feed heating system. My question is, can you attach a pump to some or all lines running off the boiler? My belief is that an old gravity feed boiler wouldn't have the heat transfer capacity to heat moving water thus rendering the system useless or terribly inefficient.

I want to raise the pipes, which run through a hallway and laundry room, into the ceiling with wirsbo. I believe it would be difficult to maintain a consistent incline, which indecently, the current pipes don't adhere to all that well, so I would like to add a pump to that line, or if necessary, all lines to keep heat flowing to these radiator.

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retrofit pump on gravity boiler

cool, would the pump need to be installed to the entire system or can it be installed to the one loop that's being modified leaving the others gravity fed. If it's installed to the modified loop alone, is a check valve or something requred and where would it be inserted, return side of other loop(s)?